Superconducting proximity effect in a transparent van der Waals superconductor-metal junction

Abstract

We report on Andreev reflections at clean NbSe2-bilayer graphene junctions. The high transparency of the junction, which manifests as a large conductance enhancement of up to 1.8, enables us to see clear evidence of a proximity-induced superconducting gap in bilayer graphene and two Andreev reflections through a vertical NbSe2-graphene and a lateral graphene-graphene junction respectively. Quantum transport simulations capture the complexity of the experimental data and illuminate the impact of various microscopic parameters on the transmission of the junction. Our work establishes the practice and understanding of an all-van-der-Waals, high-performance superconducting junction. The realization of a highly transparent proximized graphene-graphene junction opens up possibilities to engineer emergent quantum phenomena.

References in corpus (8)

• Bipolar supercurrent in graphene
• Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
• Specular Andreev reflection in graphene
• Josephson Current and Multiple Andreev Reflections in Graphene SNS Junctions
• Proximity-induced high-temperature superconductivity in topological insulators Bi2Se3 and Bi2Te3
• Zero-bias conductance peak and Josephson effect in graphene-NbTiN junctions
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Cited by in corpus (11)

• Transport spectroscopy of ultraclean tunable band gaps in bilayer graphene
• Proximity-Induced Superconductivity in Epitaxial Topological Insulator/Graphene/Gallium Heterostructures
• Proximity spin-orbit and exchange coupling in ABA and ABC trilayer graphene van der Waals heterostructures
• Local characterization and engineering of proximitized correlated states in graphene-NbSe${}_2$ vertical heterostructures
• Proximity-induced collective modes in an unconventional superconductor heterostructure
• Probing valley phenomena with gate-defined valley splitters
• Electronic and Spin-Orbit Properties of hBN Encapsulated Bilayer Graphene
• Gate-defined Kondo lattices with valley-helical quantum dot arrays
• Establishment of global phase coherence in a highly disordered fractal MgO/MgB2 nanocomposite: Roles of interface, morphology and defect
• Building 3D superconductor-based Josephson junctions using a via transfer approach
• Proximity spin-orbit coupling in graphene on alloyed transition metal dichalcogenides